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Shooting & Reloading - Mausers, Big Bores and others >> Cast Bullets
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lancaster
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alloying lead with antimony
      #258711 - 07/01/15 06:07 AM

wish to cast weights for two big bores I take a look at antimony.


anyone use antimony to harden lead and which relationship lead to antimony do you use?

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Norwegian hunter misses moose, shoots man on toilet
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bringing civilisation to the barbarians

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Rigby270
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Re: alloying lead with antimony [Re: lancaster]
      #258712 - 07/01/15 08:09 AM

Looking back to my youth in the days of hot metal /printing industry.

Linotype mix might be around 4% tin, 11% antimony and 85% lead. I sure a Google search will offer sme suggestions.

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JH

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DarylSModerator
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Re: alloying lead with antimony [Re: Rigby270]
      #258714 - 07/01/15 09:48 AM

11% antimony might be a bit higher than needed, depending on calibre and desired characteristics - meaning penetration and/or expansion.

Lyman's #46 manual lists a number of alloys suitable for casting bullets, from Monotype at 28 BHN to pure lead at 5 BHN.
BHN- meaning it's # placement on the brinel scale.
Lyman's #2 brinel is rather hard, at 15.

It is comprised of" 90% lead, 5% tin and 5% antimony.

1:1 mix of linotype (22BHN) and lead (5BHN) will yield an allow of 15 BHN.

Alloys with some arsenic, ie: American/Canadian lead shot, and non-zinc, non pure lead wheel weights which usually runs 9 to 12 BHN, respond well to heat treatement.
common
US wheelweights (non pure or zinc) usually are comprised of: 95.5% lead, .55 tin and 4 % antimony.

Tin/lead mixes, common with black powder ctg. shooters, in mixed from 10:1, to 30:1, do not respond to heat treatment. thus, a tin/lead mix can be used on a WW bullet as a soft nose, as it will not harden as the base will, if heat treated. Thus the base can be made up to about 32 BHN and penetrate like a solid, while the nose expands like a Nosler SP. Such a bullet, when driven by a slow powder and lubed with something like LBT Blue, can be driven up to 3,00fps without leading. I have personally run a .375 to 2,750fps with 270gr. GC bullets without no leading & 1 1/2" accuracy with cast bullets using heat treated WW and LBT blue.
Lyman's #2 alloy easily runs to 2,000fps in most rifles, with a good lube, of course.
The .458's and larger can use softer bullets for those speeds, allowing penetration and expansion. I've found 1:1 Pure and WW mix worked well in my .50 Sharps, .50RB and .45 cal. Sharps all the way to 2,000fps (RB). I kept the Sharps in below 1,850fps.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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lancaster
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Re: alloying lead with antimony [Re: DarylS]
      #258739 - 07/01/15 05:27 PM

with the antimony I have will get something around 10%
as I say this is not for casting bullets but for weights to made this rifles a little bit more comfortable to shoot on the bench.

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Norwegian hunter misses moose, shoots man on toilet
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